Active three-tone filter (CB20808E)

This circuit was found in an American documentation and can be added to common amplifiers of any type. The transistor can be any general purpose.

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Germanium Transistor Voltage Regulator (CB987E)
This circuit, found in an old magazine of the year 1968, uses a Power germanium transistor. This...
Oven control (CB7962E)
This sequential circuit with an optical coupler was found in a Popular Electronics from the 90s to...
Fuzz effect (CB17975E)
This guitar effect circuit was found in a 2002 documentation. The circuit can be powered by a 9 V...